Quote - This discussion reminded me of an article on the Next limit site which appears to be trying to solve a similar problem (and suggestion of replacing indirect light with direct to remove artifacts) - added link in case its of interest to someone.

Yes, except that Maxwell is a physical based render engine, so some of the techniques used there might not translate well to a render engine like FireFly.  Maxwell's "direct" lights" are far more realistic, and based on area emitter physics.  The problem they are solving is how to make the GI calculations faster, and more efficient.  In an entirely enclosed room, adding direct emitter lights in the windows, which approximate the size and shape of the windows, will accurately assist the simulation and calculation time, and speed up the render.  Poser's lights aren't physically based, and the problem is a little different, although this would be interesting to test with IDL and some object emitters in the windows.  I have a feeling, without the necessary parameters to tweak the irradience interpolation and other params, this kind of physical simulation won't work in Poser well at all.  There won't be any way to clean the results.  Using the non-physical standard lights in Poser will help, but the results won't be as realistic as emitters.  Wouldn't hurt to try though.

The technique provides a good example of something that might work well in Luxrender/Reality, or Octane though.  Worth a try.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.